جستجوی مقالات مرتبط با کلیدواژه "neodymium" در نشریات گروه "علوم پایه"

In this research, tin sulfide compounds and their dope in different percentages with neodymium were prepared by the sonochemical method. Next, the surface and structure of the synthesized samples were thoroughly analyzed using different detection techniques such as scanning electron microscopy, X-ray energy scattering, X-ray photoelectron spectroscopy, and X-ray diffraction. The X-ray diffraction pattern showed that the crystalline phase of tin sulfide and its doping with neodymium was orthorhombic and the results of elemental analysis confirmed the presence of tin, sulfur, and neodymium elements. Based on SEM images, the morphology of the prepared SnS was crystalline and changed to a nanoflower structure after Nd doping. After examining the surface morphology and structure of the synthesized samples, diffuse reflectance spectroscopy (DRS) and 4-probe techniques were employed to study the optical properties and electrical conductivity of these compounds. Band gap calculations based on absorption spectrum data indicated that the band gap decreased with the increase in dopant amount. Additionally, with the increase in the amount of dopant and temperature, the electrical resistance declined and the electrical conductivity increased.

Bi2O3 nanomaterials doped with Eu3 and Nd3 ions have been synthesized by a simple hydrothermal process at 180 °C for 48 h. Bi(NO3)3.5H2O and KOH were used as raw materials. The as-prepared materials were characterized by X-ray diffraction (XRD). The data showed that the doped Bi2O3 materials were crystalized in a monoclinic crystal structure with space group of P21/c and cell parameters of a=5.8499 Å, b=8.1698 Å and c=7.5123 Å. The morphology of the obtained nanomaterials was investigated by field emission scanning electron microscope (FESEM). The morphology was remained unchanged after doping the rare elements into Bi2O3. However, different morphology of the compounds was achieved. The FESEM images showed that the materials were composed of micro-nano rods, nanoparticles and flower structures. Elemental analyses of the doped nanomaterials were performed by energy-dispersive X-ray spectrometry (EDS). Also cell parameter refinements and interplanar spacing (d) of the obtained materials were investigated.